package com.atguigu.singleton.type3;

/**
 * @author gcq
 * @Create 2020-09-30
 */
public class SingletonTest03 {
    public static void main(String[] args) {
        Singleton instance = Singleton.getInstance();
        Singleton instance1 = Singleton.getInstance();
        System.out.println(instance == instance1);
    }
}
class Singleton {
    private static Singleton instance;

    private Singleton() {};

    // 提供一个静态的公有方法，当使用到该方法时，才去创建
    public static Singleton getInstance() {
        if (instance == null ){
            instance = new Singleton();
        }
        return instance;
    }

}